Philosophical Investigations is closer to the latter. (There's a big difference between Late and Early Wittgenstein - basically two completely different authors)
There is also a fair bit of continuity between the two--he retains one of the main theses of his earlier work: that much of our confusion about so called 'philosophical problems' is caused by people abusing language.
Another month has passed and here is a new rationality quotes thread. The usual rules are: